Question

Given below are two pairs of statements. Combine these two statements
using “if and only if ”.
(i)
p:
If a rectangle is a square, then all its four sides are equal.
q:
If all the four sides of a rectangle are equal, then the rectangle is a
square.
(ii)
p:
If the sum of digits of a number is divisible by 3, then the number is
divisible by 3.
q:
If a number is divisible by 3, then the sum of its digits is divisible by

Answer 1

@terenzreignz

Answer 2

If you are given the conditions
if P then Q
and also
if Q then P
You may combine the two statements into
P if and only if Q.

For the first one, for example...
"A rectangle is a square if and only if its four sides are equal" follows directly from the two conditionals.